[OE-core] [PATCH] classes/meson.bbclass: Explicitly mark functions as missing in MinGW

[Khem Raj]

On 2/20/20 10:51 AM, Joshua Watt wrote:
> meson (with some help from GCC) misdetects certain builtin functions as
> being present on MinGW, when in fact they are not. Fix it by explicitly
> marking the functions as missing. This requires rearranging the
> meson.cross file to put the [properties] section at the end so the
> append works properly (meson can't handle duplicate sections).
> 

patch is fine workaround, but I think meson should look for strndup in 
string.h

> Signed-off-by: Joshua Watt <JPEWhacker at gmail.com>
> ---
>   meta/classes/meson.bbclass | 25 +++++++++++++++++--------
>   1 file changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/meta/classes/meson.bbclass b/meta/classes/meson.bbclass
> index 06034e8b47..5c74658d01 100644
> --- a/meta/classes/meson.bbclass
> +++ b/meta/classes/meson.bbclass
> @@ -96,14 +96,6 @@ readelf = ${@meson_array('READELF', d)}
>   pkgconfig = 'pkg-config'
>   llvm-config = 'llvm-config${LLVMVERSION}'
>   
> -[properties]
> -needs_exe_wrapper = true
> -c_args = ${@meson_array('CFLAGS', d)}
> -c_link_args = ${@meson_array('LDFLAGS', d)}
> -cpp_args = ${@meson_array('CXXFLAGS', d)}
> -cpp_link_args = ${@meson_array('LDFLAGS', d)}
> -gtkdoc_exe_wrapper = '${B}/gtkdoc-qemuwrapper'
> -
>   [host_machine]
>   system = '${@meson_operating_system('HOST_OS', d)}'
>   cpu_family = '${@meson_cpu_family('HOST_ARCH', d)}'
> @@ -115,6 +107,23 @@ system = '${@meson_operating_system('TARGET_OS', d)}'
>   cpu_family = '${@meson_cpu_family('TARGET_ARCH', d)}'
>   cpu = '${TARGET_ARCH}'
>   endian = '${@meson_endian('TARGET', d)}'
> +
> +[properties]
> +needs_exe_wrapper = true
> +c_args = ${@meson_array('CFLAGS', d)}
> +c_link_args = ${@meson_array('LDFLAGS', d)}
> +cpp_args = ${@meson_array('CXXFLAGS', d)}
> +cpp_link_args = ${@meson_array('LDFLAGS', d)}
> +gtkdoc_exe_wrapper = '${B}/gtkdoc-qemuwrapper'
> +EOF
> +}
> +
> +do_write_config_append_mingw32() {
> +    # meson mis-detects the presence of several builtin functions in MinGW
> +    # (see https://github.com/mesonbuild/meson/issues/3672).
> +    # Explicitly mark these functions as missing in the cross file
> +    cat >>${WORKDIR}/meson.cross <<EOF
> +has_function_strndup = false
>   EOF
>   }
>   
>